yes, many have proved that many analysis charts provide benefits. well, if they do have a lot of experience about it, of course it will likely work. maybe you should also try to do analysis from the chart.
I usually don't trust them but i can use their analysis for my basic predictions to determine the price movement because use chart analysis won't enough to predict bitcoin price and i consider the percentages to predict the price use this method is only less than 50% so combine all excluded factor such as feedback news or the demands is more good
Don't trust that it will repeat its history again, just do a basis or analysis about what will happen together with those updates that will come, and it is also wise to seek the advise of some people especially your friend who does trading as well.